Abstract: The present application relates to a module comprising at least two amplifiers. The first amplifier is configured to amplify an inphase signal. The second amplifier is configured to amplify a quadrature signal. The module comprises a combiner configured to combine the at least two amplified signals. The module comprises a phase reversal unit configured to provide at least two amplified signals comprising a maximum phase difference of 2 p.

Abstract: An analogue to digital conversion unit (208, 210) comprises three analogue to digital converters (ADCs) (300, 301, 302) having different dynamic ranges. A lowest dynamic range ADC (300) and middle dynamic range ADC (301) have saturation detectors SAT for outputting a signal when the amplitude of an input analogue signal reaches their respective dynamic ranges and saturates them. The middle dynamic range ADC (301) and highest dynamic range ADC have enable inputs EN for switching themselves on. The output of the saturation detector SAT of the lowest dynamic range ADC (300) is connected to the enable input EN of the middle dynamic range ADC (301). The output of the saturation detector SAT of the middle dynamic range ADC (301) is connected to the enable input EN of the highest dynamic range ADC (302).

Abstract: A radio receiver (600) in which a local oscillator frequency is selected dependent on the level of a received signal. The received signal may be a wanted signal or an interferer, or the level of both may be measured.

Abstract: An analogue to digital conversion unit (208, 210) comprises three analogue to digital converters (ADCs) (300, 301, 302) having different dynamic ranges. A lowest dynamic range ADC (300) and middle dynamic range ADC (301) have saturation detectors SAT for outputting a signal when the amplitude of an input analogue signal reaches their respective dynamic ranges and saturates them. The middle dynamic range ADC (301) and highest dynamic range ADC have enable inputs EN for switching themselves on. The output of the saturation detector SAT of the lowest dynamic range ADC (300) is connected to the enable input EN of the middle dynamic range ADC (301). The output of the saturation detector SAT of the middle dynamic range ADC (301) is connected to the enable input EN of the highest dynamic range ADC (302).

Abstract: A method of, and a radio system (10, 12) for and a low cost receiver (12) for, receiving a Direct Sequence Spread Spectrum (DSSS) signal uses a channel filter (46) having a passband narrower than the bandwidth of the DSSS signal. Optionally the channel filter (46) is scanned incrementally across the bandwidth of the transmitted signal, and an acceptable operating frequency is selected based on a best correlation score. Optionally the bandwidth of the channel filter (46) may be changed to improve the quality of reception.

Abstract: A slave radio station (14) establishes communication with a master radio station (20) by transmitting a signal (H, J, K) intermittently, listening for a response (L), and saving power by deactivating its transmitter and receiver at other times. When the master radio station responds the slave station may synchronise periods of receiver activation with a beacon signal (B) transmitted periodically by the master station and may cease transmission of the intermittent signal.